699 lines
22 KiB
C#
699 lines
22 KiB
C#
//
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// System.Data.Common.DbCommandBuilder
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//
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// Author:
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// Tim Coleman (tim@timcoleman.com)
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//
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// Copyright (C) Tim Coleman, 2003
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//
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//
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// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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#if NET_2_0
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using System.ComponentModel;
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using System.Data;
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using System.Globalization;
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using System.Text;
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namespace System.Data.Common {
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public abstract class DbCommandBuilder : Component
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{
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bool _setAllValues;
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bool _disposed;
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DataTable _dbSchemaTable;
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DbDataAdapter _dbDataAdapter;
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private CatalogLocation _catalogLocation = CatalogLocation.Start;
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private ConflictOption _conflictOption = ConflictOption.CompareAllSearchableValues;
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private string _tableName;
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private string _catalogSeparator;
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private string _quotePrefix;
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private string _quoteSuffix;
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private string _schemaSeparator;
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private DbCommand _dbCommand;
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DbCommand _deleteCommand;
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DbCommand _insertCommand;
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DbCommand _updateCommand;
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static readonly string SEPARATOR_DEFAULT = ".";
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// Used to construct WHERE clauses
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static readonly string clause1 = "({0} = 1 AND {1} IS NULL)";
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static readonly string clause2 = "({0} = {1})";
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protected DbCommandBuilder ()
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{
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}
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private void BuildCache (bool closeConnection)
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{
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DbCommand sourceCommand = SourceCommand;
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if (sourceCommand == null)
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throw new InvalidOperationException ("The DataAdapter.SelectCommand property needs to be initialized.");
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DbConnection connection = sourceCommand.Connection;
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if (connection == null)
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throw new InvalidOperationException ("The DataAdapter.SelectCommand.Connection property needs to be initialized.");
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if (_dbSchemaTable == null) {
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if (connection.State == ConnectionState.Open)
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closeConnection = false;
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else
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connection.Open ();
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DbDataReader reader = sourceCommand.ExecuteReader (CommandBehavior.SchemaOnly | CommandBehavior.KeyInfo);
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_dbSchemaTable = reader.GetSchemaTable ();
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reader.Close ();
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if (closeConnection)
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connection.Close ();
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BuildInformation (_dbSchemaTable);
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}
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}
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private string QuotedTableName {
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get { return GetQuotedString (_tableName); }
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}
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bool IsCommandGenerated {
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get {
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return (_insertCommand != null || _updateCommand != null || _deleteCommand != null);
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}
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}
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private string GetQuotedString (string value)
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{
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if (value == String.Empty || value == null)
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return value;
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string prefix = QuotePrefix;
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string suffix = QuoteSuffix;
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if (prefix.Length == 0 && suffix.Length == 0)
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return value;
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return String.Format ("{0}{1}{2}", prefix, value, suffix);
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}
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private void BuildInformation (DataTable schemaTable)
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{
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_tableName = String.Empty;
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foreach (DataRow schemaRow in schemaTable.Rows) {
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if (schemaRow.IsNull ("BaseTableName") || (string) schemaRow ["BaseTableName"] == String.Empty)
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continue;
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if (_tableName == String.Empty)
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_tableName = (string) schemaRow ["BaseTableName"];
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else if (_tableName != (string) schemaRow["BaseTableName"])
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throw new InvalidOperationException ("Dynamic SQL generation is not supported against multiple base tables.");
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}
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if (_tableName == String.Empty)
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throw new InvalidOperationException ("Dynamic SQL generation is not supported with no base table.");
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_dbSchemaTable = schemaTable;
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}
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private bool IncludedInInsert (DataRow schemaRow)
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{
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// If the parameter has one of these properties, then we don't include it in the insert:
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// AutoIncrement, Hidden, Expression, RowVersion, ReadOnly
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if (!schemaRow.IsNull ("IsAutoIncrement") && (bool) schemaRow ["IsAutoIncrement"])
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return false;
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// if (!schemaRow.IsNull ("IsHidden") && (bool) schemaRow ["IsHidden"])
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// return false;
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if (!schemaRow.IsNull ("IsExpression") && (bool) schemaRow ["IsExpression"])
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return false;
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if (!schemaRow.IsNull ("IsRowVersion") && (bool) schemaRow ["IsRowVersion"])
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return false;
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if (!schemaRow.IsNull ("IsReadOnly") && (bool) schemaRow ["IsReadOnly"])
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return false;
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return true;
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}
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private bool IncludedInUpdate (DataRow schemaRow)
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{
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// If the parameter has one of these properties, then we don't include it in the insert:
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// AutoIncrement, Hidden, RowVersion
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if (!schemaRow.IsNull ("IsAutoIncrement") && (bool) schemaRow ["IsAutoIncrement"])
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return false;
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// if (!schemaRow.IsNull ("IsHidden") && (bool) schemaRow ["IsHidden"])
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// return false;
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if (!schemaRow.IsNull ("IsRowVersion") && (bool) schemaRow ["IsRowVersion"])
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return false;
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if (!schemaRow.IsNull ("IsExpression") && (bool) schemaRow ["IsExpression"])
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return false;
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if (!schemaRow.IsNull ("IsReadOnly") && (bool) schemaRow ["IsReadOnly"])
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return false;
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return true;
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}
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private bool IncludedInWhereClause (DataRow schemaRow)
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{
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if ((bool) schemaRow ["IsLong"])
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return false;
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return true;
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}
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private DbCommand CreateDeleteCommand (bool option)
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{
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// If no table was found, then we can't do an delete
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if (QuotedTableName == String.Empty)
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return null;
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CreateNewCommand (ref _deleteCommand);
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string command = String.Format ("DELETE FROM {0}", QuotedTableName);
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StringBuilder whereClause = new StringBuilder ();
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bool keyFound = false;
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int parmIndex = 1;
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foreach (DataRow schemaRow in _dbSchemaTable.Rows) {
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if (!schemaRow.IsNull ("IsExpression") && (bool)schemaRow["IsExpression"] == true)
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continue;
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if (!IncludedInWhereClause (schemaRow))
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continue;
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if (whereClause.Length > 0)
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whereClause.Append (" AND ");
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bool isKey = (bool) schemaRow ["IsKey"];
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DbParameter parameter = null;
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string sourceColumnName;
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if (isKey)
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keyFound = true;
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//ms.net 1.1 generates the null check for columns even if AllowDBNull is false
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//while ms.net 2.0 does not. Anyways, since both forms are logically equivalent
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//following the 2.0 approach
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bool allowNull = (bool) schemaRow ["AllowDBNull"];
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if (!isKey && allowNull) {
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parameter = _deleteCommand.CreateParameter ();
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if (option) {
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parameter.ParameterName = String.Format ("@IsNull_{0}",
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schemaRow ["BaseColumnName"]);
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} else {
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parameter.ParameterName = String.Format ("@p{0}", parmIndex++);
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}
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parameter.Value = 1;
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parameter.DbType = DbType.Int32;
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// This should be set for nullcheckparam
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sourceColumnName = (string) schemaRow ["BaseColumnName"];
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parameter.SourceColumn = sourceColumnName;
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parameter.SourceColumnNullMapping = true;
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parameter.SourceVersion = DataRowVersion.Original;
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_deleteCommand.Parameters.Add (parameter);
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whereClause.Append ("(");
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whereClause.Append (String.Format (clause1, parameter.ParameterName,
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GetQuotedString (sourceColumnName)));
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whereClause.Append (" OR ");
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}
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if (option)
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parameter = CreateParameter (_deleteCommand, schemaRow, true);
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else
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parameter = CreateParameter (_deleteCommand, parmIndex++, schemaRow);
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parameter.SourceVersion = DataRowVersion.Original;
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ApplyParameterInfo (parameter, schemaRow, StatementType.Delete, true);
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//parameter.IsNullable = allowNull;
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whereClause.Append (String.Format (clause2, GetQuotedString (parameter.SourceColumn), parameter.ParameterName));
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if (!isKey && allowNull)
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whereClause.Append (")");
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}
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if (!keyFound)
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throw new InvalidOperationException ("Dynamic SQL generation for the DeleteCommand is not supported against a SelectCommand that does not return any key column information.");
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// We're all done, so bring it on home
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string sql = String.Format ("{0} WHERE ({1})", command, whereClause.ToString ());
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_deleteCommand.CommandText = sql;
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_dbCommand = _deleteCommand;
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return _deleteCommand;
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}
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private DbCommand CreateInsertCommand (bool option, DataRow row)
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{
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if (QuotedTableName == String.Empty)
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return null;
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CreateNewCommand (ref _insertCommand);
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string command = String.Format ("INSERT INTO {0}", QuotedTableName);
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string sql;
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StringBuilder columns = new StringBuilder ();
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StringBuilder values = new StringBuilder ();
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int parmIndex = 1;
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DbParameter parameter = null;
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foreach (DataRow schemaRow in _dbSchemaTable.Rows) {
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if (!IncludedInInsert (schemaRow))
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continue;
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if (columns.Length > 0) {
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columns.Append (", ");
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values.Append (", ");
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}
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if (option)
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parameter = CreateParameter (_insertCommand, schemaRow, false);
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else
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parameter = CreateParameter (_insertCommand, parmIndex++, schemaRow);
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parameter.SourceVersion = DataRowVersion.Current;
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ApplyParameterInfo (parameter, schemaRow, StatementType.Insert, false);
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columns.Append (GetQuotedString (parameter.SourceColumn));
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// Workaround for columns that may have a default/bound value and for now,
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// the framework, don't provide a mechanism to read these values yet
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// AllowDBNull and DataRow is used to workaround #385028 by using DEFAULT
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string colName = schemaRow ["ColumnName"] as string;
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bool allowDBNull = !schemaRow.IsNull ("AllowDBNull") & (bool) schemaRow ["AllowDBNull"];
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if (!allowDBNull && row != null &&
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(row [colName] == DBNull.Value || row [colName] == null)) {
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values.Append ("DEFAULT");
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} else {
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values.Append (parameter.ParameterName);
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}
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}
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sql = String.Format ("{0} ({1}) VALUES ({2})", command, columns.ToString (), values.ToString ());
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_insertCommand.CommandText = sql;
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_dbCommand = _insertCommand;
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return _insertCommand;
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}
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private void CreateNewCommand (ref DbCommand command)
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{
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DbCommand sourceCommand = SourceCommand;
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if (command == null) {
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command = sourceCommand.Connection.CreateCommand ();
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command.CommandTimeout = sourceCommand.CommandTimeout;
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command.Transaction = sourceCommand.Transaction;
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}
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command.CommandType = CommandType.Text;
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command.UpdatedRowSource = UpdateRowSource.None;
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command.Parameters.Clear ();
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}
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private DbCommand CreateUpdateCommand (bool option)
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{
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// If no table was found, then we can't do an update
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if (QuotedTableName == String.Empty)
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return null;
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CreateNewCommand (ref _updateCommand);
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string command = String.Format ("UPDATE {0} SET ", QuotedTableName);
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StringBuilder columns = new StringBuilder ();
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StringBuilder whereClause = new StringBuilder ();
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int parmIndex = 1;
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bool keyFound = false;
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DbParameter parameter = null;
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// First, create the X=Y list for UPDATE
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foreach (DataRow schemaRow in _dbSchemaTable.Rows) {
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if (!IncludedInUpdate (schemaRow))
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continue;
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if (columns.Length > 0)
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columns.Append (", ");
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if (option)
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parameter = CreateParameter (_updateCommand, schemaRow, false);
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else
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parameter = CreateParameter (_updateCommand, parmIndex++, schemaRow);
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parameter.SourceVersion = DataRowVersion.Current;
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ApplyParameterInfo (parameter, schemaRow, StatementType.Update, false);
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//parameter.IsNullable = (bool) schemaRow ["AllowDBNull"];
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columns.Append (String.Format ("{0} = {1}", GetQuotedString (parameter.SourceColumn), parameter.ParameterName));
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}
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// Now, create the WHERE clause. This may be optimizable, but it would be ugly to incorporate
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// into the loop above. "Premature optimization is the root of all evil." -- Knuth
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foreach (DataRow schemaRow in _dbSchemaTable.Rows) {
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if (!schemaRow.IsNull ("IsExpression") && (bool) schemaRow ["IsExpression"] == true)
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continue;
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if (!IncludedInWhereClause (schemaRow))
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continue;
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if (whereClause.Length > 0)
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whereClause.Append (" AND ");
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bool isKey = (bool) schemaRow ["IsKey"];
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if (isKey)
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keyFound = true;
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//ms.net 1.1 generates the null check for columns even if AllowDBNull is false
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//while ms.net 2.0 does not. Anyways, since both forms are logically equivalent
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//following the 2.0 approach
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bool allowNull = (bool) schemaRow ["AllowDBNull"];
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if (!isKey && allowNull) {
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parameter = _updateCommand.CreateParameter ();
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if (option) {
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parameter.ParameterName = String.Format ("@IsNull_{0}",
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schemaRow ["BaseColumnName"]);
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} else {
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parameter.ParameterName = String.Format ("@p{0}", parmIndex++);
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}
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parameter.DbType = DbType.Int32;
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parameter.Value = 1;
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parameter.SourceColumn = (string) schemaRow ["BaseColumnName"];
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parameter.SourceColumnNullMapping = true;
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parameter.SourceVersion = DataRowVersion.Original;
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whereClause.Append ("(");
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whereClause.Append (String.Format (clause1, parameter.ParameterName,
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GetQuotedString ((string) schemaRow ["BaseColumnName"])));
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whereClause.Append (" OR ");
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_updateCommand.Parameters.Add (parameter);
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}
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if (option)
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parameter = CreateParameter (_updateCommand, schemaRow, true);
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else
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parameter = CreateParameter (_updateCommand, parmIndex++, schemaRow);
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parameter.SourceVersion = DataRowVersion.Original;
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//parameter.IsNullable = allowNull;
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ApplyParameterInfo (parameter, schemaRow, StatementType.Update, true);
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whereClause.Append (String.Format (clause2, GetQuotedString (parameter.SourceColumn), parameter.ParameterName));
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if (!isKey && allowNull)
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whereClause.Append (")");
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}
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if (!keyFound)
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throw new InvalidOperationException ("Dynamic SQL generation for the UpdateCommand is not supported against a SelectCommand that does not return any key column information.");
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// We're all done, so bring it on home
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string sql = String.Format ("{0}{1} WHERE ({2})", command, columns.ToString (), whereClause.ToString ());
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_updateCommand.CommandText = sql;
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_dbCommand = _updateCommand;
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return _updateCommand;
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}
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private DbParameter CreateParameter (DbCommand _dbCommand, DataRow schemaRow, bool whereClause)
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{
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string sourceColumn = (string) schemaRow ["BaseColumnName"];
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DbParameter parameter = _dbCommand.CreateParameter ();
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if (whereClause)
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parameter.ParameterName = GetParameterName ("Original_" + sourceColumn);
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else
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parameter.ParameterName = GetParameterName (sourceColumn);
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parameter.SourceColumn = sourceColumn;
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//parameter.Size = (int) schemaRow ["ColumnSize"];
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_dbCommand.Parameters.Add (parameter);
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return parameter;
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}
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private DbParameter CreateParameter (DbCommand _dbCommand, int paramIndex, DataRow schemaRow)
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{
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string sourceColumn = (string) schemaRow ["BaseColumnName"];
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DbParameter parameter = _dbCommand.CreateParameter ();
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parameter.ParameterName = GetParameterName (paramIndex);
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parameter.SourceColumn = sourceColumn;
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//parameter.Size = (int) schemaRow ["ColumnSize"];
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_dbCommand.Parameters.Add (parameter);
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return parameter;
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}
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[DefaultValue (CatalogLocation.Start)]
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public virtual CatalogLocation CatalogLocation {
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get { return _catalogLocation; }
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set {
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CheckEnumValue (typeof (CatalogLocation),
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(int) value);
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_catalogLocation = value;
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}
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}
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[DefaultValue (".")]
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public virtual string CatalogSeparator {
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get {
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if (_catalogSeparator == null || _catalogSeparator.Length == 0)
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return SEPARATOR_DEFAULT;
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return _catalogSeparator;
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}
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set { _catalogSeparator = value; }
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}
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[DefaultValue (ConflictOption.CompareAllSearchableValues)]
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public virtual ConflictOption ConflictOption {
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get { return _conflictOption; }
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set {
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CheckEnumValue (typeof (ConflictOption),
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(int) value);
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_conflictOption = value;
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}
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}
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[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
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[Browsable (false)]
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public DbDataAdapter DataAdapter {
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get { return _dbDataAdapter; }
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set { if (value != null)
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SetRowUpdatingHandler (value);
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_dbDataAdapter = value;
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}
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}
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[DefaultValue ("")]
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public virtual string QuotePrefix {
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get {
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if (_quotePrefix == null)
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return string.Empty;
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return _quotePrefix;
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}
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set {
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if (IsCommandGenerated)
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throw new InvalidOperationException (
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"QuotePrefix cannot be set after " +
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"an Insert, Update or Delete command " +
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"has been generated.");
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_quotePrefix = value;
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}
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}
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[DefaultValue ("")]
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public virtual string QuoteSuffix {
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get {
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if (_quoteSuffix == null)
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return string.Empty;
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return _quoteSuffix;
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}
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set {
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if (IsCommandGenerated)
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throw new InvalidOperationException (
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"QuoteSuffix cannot be set after " +
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"an Insert, Update or Delete command " +
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"has been generated.");
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_quoteSuffix = value;
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}
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}
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[DefaultValue (".")]
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public virtual string SchemaSeparator {
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get {
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if (_schemaSeparator == null || _schemaSeparator.Length == 0)
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return SEPARATOR_DEFAULT;
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return _schemaSeparator;
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}
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set { _schemaSeparator = value; }
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}
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[DefaultValue (false)]
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public bool SetAllValues {
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get { return _setAllValues; }
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set { _setAllValues = value; }
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}
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private DbCommand SourceCommand {
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get {
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if (_dbDataAdapter != null)
|
|
return _dbDataAdapter.SelectCommand;
|
|
return null;
|
|
}
|
|
}
|
|
|
|
protected abstract void ApplyParameterInfo (DbParameter parameter,
|
|
DataRow row,
|
|
StatementType statementType,
|
|
bool whereClause);
|
|
|
|
protected override void Dispose (bool disposing)
|
|
{
|
|
if (!_disposed) {
|
|
if (disposing) {
|
|
if (_insertCommand != null)
|
|
_insertCommand.Dispose ();
|
|
if (_deleteCommand != null)
|
|
_deleteCommand.Dispose ();
|
|
if (_updateCommand != null)
|
|
_updateCommand.Dispose ();
|
|
if (_dbSchemaTable != null)
|
|
_dbSchemaTable.Dispose ();
|
|
}
|
|
_disposed = true;
|
|
}
|
|
}
|
|
|
|
public DbCommand GetDeleteCommand ()
|
|
{
|
|
return GetDeleteCommand (false);
|
|
}
|
|
|
|
public DbCommand GetDeleteCommand (bool useColumnsForParameterNames)
|
|
{
|
|
BuildCache (true);
|
|
if (_deleteCommand == null || useColumnsForParameterNames)
|
|
return CreateDeleteCommand (useColumnsForParameterNames);
|
|
return _deleteCommand;
|
|
}
|
|
|
|
public DbCommand GetInsertCommand ()
|
|
{
|
|
return GetInsertCommand (false, null);
|
|
}
|
|
|
|
public DbCommand GetInsertCommand (bool useColumnsForParameterNames)
|
|
{
|
|
return GetInsertCommand (useColumnsForParameterNames, null);
|
|
}
|
|
|
|
internal DbCommand GetInsertCommand (bool useColumnsForParameterNames, DataRow row)
|
|
{
|
|
BuildCache (true);
|
|
if (_insertCommand == null || useColumnsForParameterNames)
|
|
return CreateInsertCommand (useColumnsForParameterNames, row);
|
|
return _insertCommand;
|
|
}
|
|
|
|
public DbCommand GetUpdateCommand ()
|
|
{
|
|
return GetUpdateCommand (false);
|
|
}
|
|
|
|
public DbCommand GetUpdateCommand (bool useColumnsForParameterNames)
|
|
{
|
|
BuildCache (true);
|
|
if (_updateCommand == null || useColumnsForParameterNames)
|
|
return CreateUpdateCommand (useColumnsForParameterNames);
|
|
return _updateCommand;
|
|
}
|
|
|
|
protected virtual DbCommand InitializeCommand (DbCommand command)
|
|
{
|
|
if (_dbCommand == null) {
|
|
_dbCommand = SourceCommand;
|
|
} else {
|
|
_dbCommand.CommandTimeout = 30;
|
|
_dbCommand.Transaction = null;
|
|
_dbCommand.CommandType = CommandType.Text;
|
|
_dbCommand.UpdatedRowSource = UpdateRowSource.None;
|
|
}
|
|
return _dbCommand;
|
|
|
|
}
|
|
|
|
public virtual string QuoteIdentifier (string unquotedIdentifier)
|
|
{
|
|
throw new NotSupportedException ();
|
|
}
|
|
|
|
public virtual string UnquoteIdentifier (string quotedIdentifier)
|
|
{
|
|
if (quotedIdentifier == null) {
|
|
throw new ArgumentNullException ("Quoted identifier parameter cannot be null");
|
|
}
|
|
string unquotedIdentifier = quotedIdentifier.Trim ();
|
|
if (unquotedIdentifier.StartsWith (this.QuotePrefix)) {
|
|
unquotedIdentifier = unquotedIdentifier.Remove (0, 1);
|
|
}
|
|
if (unquotedIdentifier.EndsWith (this.QuoteSuffix)) {
|
|
unquotedIdentifier = unquotedIdentifier.Remove (unquotedIdentifier.Length - 1, 1);
|
|
}
|
|
return unquotedIdentifier;
|
|
}
|
|
|
|
public virtual void RefreshSchema ()
|
|
{
|
|
_tableName = String.Empty;
|
|
_dbSchemaTable = null;
|
|
_deleteCommand = null;
|
|
_updateCommand = null;
|
|
_insertCommand = null;
|
|
}
|
|
|
|
protected void RowUpdatingHandler (RowUpdatingEventArgs rowUpdatingEvent)
|
|
{
|
|
if (rowUpdatingEvent.Command != null)
|
|
return;
|
|
try {
|
|
switch (rowUpdatingEvent.StatementType) {
|
|
case StatementType.Insert:
|
|
rowUpdatingEvent.Command = GetInsertCommand (false, rowUpdatingEvent.Row);
|
|
break;
|
|
case StatementType.Update:
|
|
rowUpdatingEvent.Command = GetUpdateCommand ();
|
|
break;
|
|
case StatementType.Delete:
|
|
rowUpdatingEvent.Command = GetDeleteCommand ();
|
|
break;
|
|
}
|
|
} catch (Exception e) {
|
|
rowUpdatingEvent.Errors = e;
|
|
rowUpdatingEvent.Status = UpdateStatus.ErrorsOccurred;
|
|
}
|
|
}
|
|
|
|
protected abstract string GetParameterName (int parameterOrdinal);
|
|
protected abstract string GetParameterName (String parameterName);
|
|
protected abstract string GetParameterPlaceholder (int parameterOrdinal);
|
|
|
|
protected abstract void SetRowUpdatingHandler (DbDataAdapter adapter);
|
|
|
|
protected virtual DataTable GetSchemaTable (DbCommand sourceCommand)
|
|
{
|
|
using (DbDataReader rdr = sourceCommand.ExecuteReader ())
|
|
return rdr.GetSchemaTable ();
|
|
}
|
|
|
|
static void CheckEnumValue (Type type, int value)
|
|
{
|
|
if (Enum.IsDefined (type, value))
|
|
return;
|
|
|
|
string typename = type.Name;
|
|
string msg = string.Format (CultureInfo.CurrentCulture,
|
|
"Value {0} is not valid for {1}.", value,
|
|
typename);
|
|
throw new ArgumentOutOfRangeException (typename, msg);
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|